Glazier s diamond-tool



(No Model.)

l A. T. DUNCAN.

GLAZIBBJS DIAMOND TOOL.

Patented June 21, 1887.

W l i f l m N PETERS. Phnm-Lnhogmpher. wnshmgmn D. C

ARTHUR THOMPSON DUNCAN, OF CLINTON, MISSOURI.

GLAZIERS DIAMOND-TOOL.

SPECIFICATION forming part of Letters Patent No. 365,057, dated .Tune21, 1887.

Application ilcd February 26, 1587. Serial No. 2'29,0l0. (No model.)

To all whom it may concern,.-

Be it known that I, ARTHUR THOMPSON DUNCAN, a citizen of the UnitedStates, residing at Clinton, in the county of Henry and State ofMissouri, have invented new and useful Improvements in Grlaziers7DiamondTools, of which the following is a specification.

My invention relates to improvements in glaziers diamond-tools; and itsobjects are to set the diamond at any suitable longitudinal orlateralangle, and to hold it constantly at sald angle; to give the diamonddifferent degrees of constant pressure upon the glass, so as to cut moreor less deeply into the same; to cut plane surfaces as easily andaccurately in curved lines as in straight lines, and curved surfaces aseasily and accurately as plane surfaces, and to enable unskilled personsto eut glass into the required shapes as easily as those skilled in theart. These objects I attain by means ofthe construction and arrangementof a fra-me or handle and adjusting mechanism, hereinafter described,illustrated in the drawings, and pointed out in the claims heretoappended.

In the accompanying drawings, Figure l represents a perspective view ofthe complete device, showing the slotin the guide-plate and the diamondand holder therein. Fig. 2 represents a reversed plan view of the same.Flg. 3 represents a plan view of the guideplate and adjusting mechanismdetached from the handle or frame. Figs. 4 and 5, respect1 ively,represent opposite side views ot' the same, the vertical portion of theguide-plate being cut away in the former view to show more clearly themechanism. Fig. 6 represents a perspective view ofthe blocks holding thediamond and the means by which the same is rotated to different angles.Fig. 7 represents a detail View of the mechanism for giving the diamonddifferent longitudinal angles. Fig. S represents a section on the line x.fr of Fig. 3, showing the mechanism for giving the diamond differentlateral angles. Fig. 9 represents a section on the line y y of Fig. 3,to show the mechanism by which the pressure of the diamond on the glassis regulated.

Referring to the drawings, A designates the handle or frame, ofblock-like form, rounded on top to accommodate itself to the hand, and

suitably hollowed out to contain the adjusting mechanism.

B is the guideplate,secured to the handle by screws having their headscountersunk, and composed of the horizontal plate b andthe ver ticalplate b, standing from one edge of the latter.

bt is a transverse slot running to the inner or guide side of the plate,and extending up into the vertical part thereof, for a purposehereinafter explained.

The mechanism by means of which the diaA mond is adjusted is describedas follows:

C is the diamond, secured in the lower end of the ordinary-shaped holderor block c,in the usual manner. The said holder has a recess in itsupper end, into which is inserted a rod, d, upon which the block c canrotate, and can be fixed at any angle thereon by means of the set-screwc', which enters a threaded open ing in the side of the holder andimpinges on the rod d. rIhe said rod stands outward, and then bendsdownward from the upper part of a plate, D, pivoted upon a plate, E,hereinafter described, and having on its upper edge the teeth d,arrangedon an are concentric with its pivotal point. The plate E is providedwith a curved slot, c, also concentric with the pivot-point ofthe plateD, and having passing through it from said plate a tapped or screw piu,cl2, by means of which and the nut d on said pin the plates D and E a-reheld closely together.

e is a wornrshaft having bearings in lugs c2 on the upper edge of theplate E, and engag ing with the teeth d, so as to set the plate D, andconsequently the diamond, at different angles longitudinally with regardto the handle.

The lower edge ot' the plate E is secured to the longitudinal arm fof arectangular adj usting-piece, F, the end ofthe transverse armf of whichis pivoted upon .the inner end of a longitudinal arm, g, of a transverseoscillating or rock shaft, G, which has bearings in the uprights h h,rising from the A[loorof the guideplate B.

fl is a tapped or screw pin, which extends outward from the angle of theadjusting-piece F, and passes through a slot, g', made in a transverseplate, g2, standing inward from near the end of the arm g, the said slotbeing on an lOO right h', and enters a corresponding recess in the otherend of said shaft. A nut, h, engages the screw on the outside of theupright. These conical bearings are for the purpose of setting thedescribed angles more accurately.

I is a strong spring having its inner end bifureated and pivoted to thelower end of a link, t', the upper end of which is pivoted at asuitablepoint upon a flattened part of the arm g of the shaft G. The outer endof the spring passes under a bracket, K, and a transverse retaining-bar,7c, having its ends secu-red in the side plates of said bracket, and isbent upward, forming the arm t', which inelines outward from the bracketK.

7c is a regulating or adjusting screw, which passes through an openingin the arm i', and engages a threaded opening in the upper part of thetransverse plate of thebracket K. The tendency of the spring k is todraw down the arm g, and consequently the diamond,with a certain degreeof force. This force is increased by turning the screw 7c inward,because this action forces the arm t" toward the bracket K, andconsequently forcesthe longitudinal arm of the spring downward. Thus thepressure of the diamond on the glass and the depth of its eut therein isregulated by the screw 7c.

Before the guide-plate and attached mechanism are secured to thehandle,the block cis set on the 'rod d, and the longitudinal and lateralangles of the diamond are adj usted by the described means, so that thelatter will cut to its best advantage on its natural angle, which is itsonly cutting-angle; but the pressure upon the glass can be regulated atany time so the head of the screw 7c projects through an opening in thehandle.

In operation the horizontal part of the guideplate rests upon the glasslto be cut, being pressed down thereon so that the diamond can forceitself into the glass, and in cutting straight, the vertical plate b isplaced against and guided Y by a straight-edge or ruler placed in properposition. When cutting circular or oval lines, the said plate b isplaced againsta guide-piece of similar form to the cutting desired andits edge inserted in the slot Z2 of the saine in such manner that itwill rest against the edges of the slot. Thetool is then carried aroundthe guide-piece, with the edges of the slot engaged thereon, until thecircle or oval is complete. A circle can also be cut by tying a cord tothe ends of the tool and a second cord to the center of the first andusing the second cord as a radius; or any desired curve may be eut byputting a piece of paper marked with said curve below the glass to beeut and following the line with the tool. In cutting convex glass, likethat in many show-cases,the said glass will enter the slot bl of theplate b, and the tool can be guided by the edges of the slot, asdescribed, in cutting curves on plane surfaces.

- The device is drawn toward the operator when in use and not shovedlike a plane.

The ends of the plate b,which extend beyond the handle, are providedwith'athe notches or nicks Z Z, which glaziers use in separating the cutpieces of glass.

Havingdescribed my invention, I claim- 1. In a glaziers diamond-tool,the eombina-V tion of the'slotted guide-plate, the handle, and thediamond secured thereto so as to project through the slot in theguide-plate, substan-l tially as specified.

2. In a glaziers diamond-tool, the combination of the handle, thetransversely-slotted' guide-plate secured to said'handle, the diamondsecured to a suitable block so as to project through the lslot in theguide-plate, and means, substantially as described, whereby the diamondmay be adj usted in position to cut to the best advantage on a naturalangle, substana tialiy as specified.

3. In a glaziers diamond-tool, the combination of the handle, thetransversely-slotted guide-plate, and mechanism, substantially asdescribed, whereby the pressure ofthe diamond on the glass may beregulated to cause it to cut more or less depth therein, substantiallyas specified. l

4. rIhe combination, with the handle, the slotted guide-plate, and thediamond supported in the handle by means substantially as described, ofthe rod d, forming part of the supporting mechanism, the block c,holding the ICO diamond, and the set-screw c', substantially as Y andfor the purpose specified.

5. The combination, with the handle, the slotted guide-plate, and thediamond supported in the handle by means substantially as described, ofthe plate E, provided with the curved slot e, the plate D, provided withthe teeth d and screw-pin d2, and pivoted, as described, upon theplateE, the nut d, engaging the pin d2, and the Worm-shaft e', havingbearings in the lugs e2, and engaging the teeth d, substantially as andfor the purpose specified.

6. The combination, with the handle, the slotted guide-plate, and thediamond supported in the handle by means substantially as described, o'fthe plate E,'the rectangular adjusting-piece F, provided with thescrew-pin f2 and the nut g, the rock-shaft G, provided with the arm g,on which the piece F is pivoted, and the plate gprovided with the curvedslot g', substantially as and for the purpose speciiied.

7. The combination, with the handle, the

handle both longitudinally and laterally and the pressure of the diamondon the glass can be regulated, substantially as specified.

In testimony that I claim the foregoing as my I5 own I have heretoafiixed my siguaturein presence of two witnesses.

ARTHUR THOMPSON DUNCAN.

Vitnesscs:

CHARLES B. W rLsoN, XV. S. DUNCAN.

